>>48395136If that image you're using is there to illustrate a point, keep in mind that it appears to be panned out to a point where Pokemon may not have spawned yet.
While I'm at it, I'd also like to make another point about expansive overworlds.
Big overworlds need empty spaces and time spans of nothingness every so often not only because it's grounded in reality but also because it keeps things interesting. How? Well for one, being constantly bombarded with stimuli in such a big place can get exhausting and boring rather quickly. Additionally, it makes events more exciting when something actually DOES happen. Imagine you're out farming for supplies when a large Pokemon shows up out of nowhere, catching you off guard.
I think the most effective overworlds are those that are massive (if not open), dynamic, and offer times of rest and reprieve. Such an overworld would provide times when Pokemon spawns increase drastically and times when it appears dead and barren for miles before something pops up. Have non-mission related events happen randomly where areas that were once dead are suddenly occupied by a newly built human settlements or a Pokemon den one day, and be suddenly destroyed days later. Add in some weather changes, traveling trainers, merchants, "bounties" (already hinted to be in the game)—things like that. Just keep the overworld dynamic and it will be a recipe for success.